Thread waxing device



Jan. 12, 1932. A. F. CARLSON THREAD WAXING DEVICE Filed July 12, 1929INVENTOR M F.

ATTORNEYS,

Patented Jan. 12, 1932 UNITED STATES PATENT OFFICE,

AXEL Fo KEcARLSoN, or CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO nnncn SHOEMACHINERY CQMPANY, or BoS'roN, MASSACHUSETTS, A oonroaa'rzon or MAINETHREAD WAXING DEVICE Application filed July 12,

This invention is a novel thread waxing device, being adaptedparticularly for use with wax thread sewing machines, such for exampleas the Reece shoe stitchingmachine, of which an instance is illustratedin Patent Number 1,420,580, granted June 20, 1922, and the earlierpatents mentioned therein, showing a welt-and-turn shoe sewing machine;but adapted also for other waxing or similar treating of threads, cordsand the like. The

present invention pertains more especially to wax pots wherein the waxis maintained in a molten condition and is applied to the thread drawnthrough the wax, an instance of such wax pot being illustrated in theprior patent of Schoenky 1,177,967, granted April 4, 1916 wherein thethread is drawn through the molten wax and is subjected to a strippingaction as it passes outof the pot to re- 3 move surplus wax.

' The general object of the present invention is to improve theefliciency and convenience of thread'waxing devices of the kind referredto. A particularobject is to afford an imscribed. i

It'has h'eretoforebeen proposed to carry theentering thread andthedelivered thread through the upper part of the wax pot, passingaround a submerged guide, and the downthread twisted about therip-thread for the purpose of stripping the surplus wax from the latter.but it is believed that such devices h ve not been successful. becauseof the mode of adjustment of twist bv rotating the submerged threadguide and' because of the need 1929. Serial No. 377,674.

of a spreader between the down-thread and up-thread between the level ofthe wax and the twisted portion of the thread in order to maintain thelatter out of the molten wax.

According to the present invention, means are provided cooperating withthe thread guides for altering or adjusting the Spread of thethreads,below or above the wax level, or both, or for changing the tightness ofthe twist, so as to regulate the stripping action without rotaryadjustment, and the spread of the submerged portions of thread being sowide as to maintain the twist at a position substantially above the waxlevel, so as to dispense with a Spreader above the wax level between thetwo threads and the accumula-, tion of wax thereon.

The invention may be described in one aspect as a thread waxing ortreating device having an entering thread guide and a delivering guide,with a submerged guide arranged so that the down-thread may be twistedwith one or two or more turns about the rip-thread for the purpose ofstripping the latter, together with means cooperating with said guidesfor altering the spread of the thread above and below the t-WlSt,'OI'changing the tightness of the twist, to regulate the stripping action.

In the accompanying drawings Fig. 1 is a Substantially centrallongitudinal vertical section of a waxing device illustrating theprinciples of the present invention.

Fig. 2 is a top plan view taken partly in horizontal sectionsubstantially at the plane 22 of Fig. 1.

Fig. 3 is a fragmentary top plan view of the entering and deliveringthread guides and other parts not shown in Fig. 2.

The wax or other treating material is maintained in a vessel which maybe of the design shown or other suitable design. The wax or pot vesselis divided into chambers. It comprises first a supply chamber 11 formedat the left end of the vessel by means of a wall or partition 12 whichis preferably removable. The lower part of th s wall is shown ascentrally slitted to form a feed gate 13 by which wax melting in thetiallysurrounded by the molten wax sotnat the heat is delivered mainlyto the wax and chamber 11 may flow through to the main or waxing chamber14.

i In the waxing chamber 1 1 the level of the wax is shown at 15. Thischamber is formed by the side walls of the vessel together with theremovable wall 12 and a wall in isolated positions in the waxing chamber14, each of these for example being arranged to receive an electricresistance heating unit.

These heating chambers being spaced away from the side walls of thevessel are substanoverheating of the vessel walls is minimized.

The course of the thread may be substantially as follows. The threadstretch afrom the supply is shown coming to the wax pot above the levelof the removable'cover 20. The thread firstpasses over an entering guide21 which may be in the form of a small wheel or pulley. The thread thenpasses down at b to the point where, at 0 it is twisted around theupcoming thread. Beyond the twist the down-thread passes atv (Z to thesubmerged thread guide 01 wheel 22 which is of substantial diameter sothat the twisted part of the thread will naturally take a positionsubstantially abovetthe wax level. After passing around the submergedguide or wheel 22 the thread ascends at e to the point where it isengaged at fby the downcoming thread 0; Abovethe-twist the up-threadpasses at g to the delivery guide or pulley 23 from which the thread isshown passing off at h to the sewingmachine, bobbin or other place ofdisposal.v i p I With the arrangement of guides thus described it isclear that a certain regulation of twist and stripping'actions maybeefiected by passing thedown-thread a greater or less number of timesaround the up-thread.,-"It

is shown making three twists about the upthread, which might beincreased or decreased. The wax carried up on the up thread'is usuallyin excess, and having to pass through several twists of down-thread thewax is caused to be stripped partially from the lip-thread leaving thelatter in a fairly uniform condition. whilethe surplus wax isprogressively carried downwardly by the down-thread. which thereafterpasses into the molten wax, this arrangement avoiding the depositing ofwax upon mechanical parts of the device. 7

and in dotted lines.

In order to give a finer'regulation of the stripping action thisinvention operates by maintaining the amount of twist, but altering thetightness of the twist or tension upon the threads. This may be done indifferent ways, for example by altering the spread of the threads aboveand below the point 01 twist.

Inthe illustrated embodiment of the invention the adjustment ofstripping action is secured primarily by altering the spread between thelower sections ofthreads d and e passing around the lower or submergedguide 22. If the amount of spread at the lower end is increased thiswill tighten up the twist and give a more effective stripping action.This may be accomplished for example by the employment of a submergedspreading or deflecting means 24 shown in the form of a simple eyesurrounding the thread stretch d. Fig. 1 shows this device both in fulllines The normal position is in full lines, but when shifted to thedotted line position the thread section (1 will be deflected to itsdotted line position as shown. A convenient way to afford the statedresults is to mount the eye or deflector 24 upon a carrier or bar 25.This is shown extending upwardly toa point above the molten wax where itis pivoted at 26, for example on the wall 16. An extension 27 of the baris shown extending; upwardly above the pivot, with adjusting means atits upper end in the form of a screw 28 which may be turned manually toshift the position of the bar and thereby alter the travel of thedown-thread and the stripping" action. 7 The screw 28 may be located inany convenient place, above .or below the removable cover 20, forexample on the vertical wall 16, but is shown engageable ina threadedboss upstanding from the cover 20, in which case'the connection betweenthe lever part 27 and the screw may be a mere abutting connection or adetachable device.

In conjunction with the described adjustmentthere may be a complementaryadjustment of the thread section Z); For example it may beput undergreater or less tension to increase or decrease the tightness of, twist,namely by a tension device applied to the thread section'a or a frictiondevice applied to the entering guide 21. However, an ad vantageous wayof handling the upper adjustment is by a means of a deflector or lever29 shown mounted on top of the cover 20, having a thread engaging notch30, and a clamping nut 31 for holding the lever in any swung position.By this arrangement the spread principles of the invention it is notintended twist.

2. In a thread waxing or analogous device, an entering thread guide anda delivery guide, both located above the wax level, and a submergedguide, said guides so arranged that the down-thread may be twisted agreater or less numberoi' turns about the upthread, for strippingmaterial from the latter, and a submerged eye cooperating with saidguides and movable for altering the spread of the submerged threads andthereby the tightness of twist of the threads.

3. In a thread waxing or analogous device, an entering thread guide anda delivery guide, both located above the wax level, and a submergedguide, said guides so arranged that the down-thread may be twisted aboutthe up-thread, for stripping material from the latter, and meanscooperating with said guides for altering the spread of the threadportions below the wax level.

4. In a thread waxing or analogous device. an entering thread guide anda delivery guide, both located above the wax level, and a submergedguide, said guides so arranged that the down-thread may be twisted aboutthe rip-thread, for stripping material from the latter, and meanscooperating with said guides for altering the spacing of the enteringand delivery guides above the wax level.

5. In a thread waxing or analogous device, an entering thread guide anda delivery guide, both located above the wax level, and a submergedguide, said guides so'arranged that the down-thread may be twisted aboutthe rip-thread, for stripping material from the latter, and meanscooperating with said guides for altering the spread of the threadportions both above and below the wax level. 6. A device as in claim 3and wherein the spread altering means is a deflector having means forshifting it inwardly or outwardly with the submerged thread. 7

7 In a thread waxing or analogous device, an entering thread guide and adelivery guide, both located above the wax level, and a submerged guide,said guides so arranged that the clown-thread may be twisted about theup-thread, for stripping material from the latter, and means cooperatingwith said guides for altering the tension of the downthread twistedabout the up-thread, without altering its number of turns about the upthread.

8. In a thread waxing device a vessel for holding molten wax with meansfor heating the waxing chamber thereof, means for guiding the threaddownwardly into the vessel and through the waxing chamber and upwardlytherefrom with the down-thread twisted about the up-thread above the waxlevel in the chamber to strip excess wax from the up-thread, an overflowgate from the waxchamber at a level ensuring that the molten wax thereinwill not submerge the twisted portions of thread, and a wax supplychamber wherein solid wax may be gradually melted and delivered to thewaxing chamber.

In testimony whereof, this specification has been duly signed by:

AXEL FOLKE OARLSON.

